Google launched a 64-bit Chrome for Windows in August. But because that browser requires Windows 7 or later, the Mountain View, Calif. company continues to crank out 32-bit versions for PCs running Windows Vista or the already-retired Windows XP.
Of the 42 vulnerabilities patched in Chrome 39, 12 qualified for bug bounties, which ranged from a high of $16,500 split four ways to a handful of $500 rewards paid to individual researchers.
Last month, Google tripled the maximum bounty for bug reports from $5,000 to $15,000. Its top award for Chrome 39's collection was $7,500 for a "double free" flaw in Adobe's Flash, which is packaged with Chrome.
Eleven of the 12 that Google called out in a short advisory were rated "high," the company's second-most-severe threat level.
Chrome 39 can be downloaded from Google's website. Existing users will automatically be updated to the newest version.
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